I'm sure similar arguments were made when baseball and softball were introduced as Olympic sports. It didn't happen, and those sports are no longer included in the Olympics. And it's not as if there are many countries that are really "lacking in just one of the 4 disciplines." For example, although Finland sent entries to Europeans in three discipline, its male singles skater and its dance couple didn't make it out of the Preliminaries. In fact, they weren't even close to qualifying for the Short Program.